Oil pump parameters:
- oil pressure:
- at idle 0.5 kgf/cm²;
- at a frequency of 2000 min⁻¹ 3 – 4 kgf/cm²;
- at a frequency of 4000 min⁻¹ 4 – 5 kgf/cm²;
- maximum radial clearance between the outer rotor and the housing – 0.18 mm;
- axial clearance:
- between rotors 0.08 mm;
- internal rotor, maximum 0.08 mm;
- outer rotor 0.09 mm;
- between the rotors and the plane of the pump body 0.04 – 0.09 mm.
After the oil filter, a pressure reducing valve is installed, which, when the pressure increases above the set value, discharges excess oil into the oil bath (pan). When the filter is clogged, the bypass valve directs unfiltered oil directly into the pressure line. The opening pressure of the pressure reducing valve is 4.2±0.5 kgf/cm².
A check valve is installed in the oil filter nipple, which prevents oil from leaking out of the channels and hydraulic valve lifters after the engine has stopped.
The purified oil is supplied via the pressure line and its branches to the main bearings of the crankshaft. Through inclined holes in the body of the crankshaft, the oil is supplied to its connecting rod journals and is sprayed to the piston pins and cylinder mirrors. At the same time, the engine oil is supplied via vertical channels to the cylinder head to the camshaft bearings, cylindrical hydraulic compensators of the valve drive levers, valve guides, and to the timing chain tensioners.